An accident can turn out to be good luck if the accident results in a positive occurrence. For example, consider a lady that injured herself while cooking. As a result, she had to go to the emergency room to get stitches. While at the hospital, she meets her future partner, they become acquittances, friends, lovers, they get married and they live happily ever after.
Another example: A man got food poisoning and was not able to go to work the next day. The next day the building collapses.
An accident is an event that occurs unintentionally or without prior planning. It sometimes leads to injuries or damages.
Good luck can be described as a favourable outcome
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